CN112462275A - Battery pack cycle life testing method - Google Patents
Battery pack cycle life testing method Download PDFInfo
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- CN112462275A CN112462275A CN201910848657.6A CN201910848657A CN112462275A CN 112462275 A CN112462275 A CN 112462275A CN 201910848657 A CN201910848657 A CN 201910848657A CN 112462275 A CN112462275 A CN 112462275A
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- 238000012360 testing method Methods 0.000 title claims abstract description 149
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000007600 charging Methods 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000010280 constant potential charging Methods 0.000 claims description 3
- 238000012827 research and development Methods 0.000 abstract description 6
- 238000010998 test method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The invention provides a method for testing the cycle life of a battery pack, which is used for testing the cycle life of the battery pack under a set working condition, and detecting the actual capacity of the battery pack after X times of cycle testing; carrying out cycle life test on the single batteries in the same batch with the single batteries in the battery pack under a standard working condition, and detecting the actual capacity of the single batteries after carrying out cycle test for X times; judging whether the actual capacity of the battery pack after the X times of the cycle test is more than or equal to Y times of the actual capacity of the single battery after the X times of the cycle test: and if the current value is larger than or equal to the preset value, judging that the cycle life test of the battery pack reaches the standard. According to the invention, the cycle life test result of the battery pack is analyzed and compared with the cycle life test result of the single battery in the battery pack, so that whether the cycle life test result of the battery pack reaches the standard can be judged by performing a few cycle life tests on the battery pack, the test period is greatly shortened, and the research and development cost is saved.
Description
Technical Field
The invention belongs to the technical field of battery pack service life testing, and particularly relates to a battery pack cycle life testing method.
Background
With the continuous development of science and technology and the continuous aggravation of environmental and energy crisis, new energy automobiles are also more and more widely applied due to the characteristics of low carbon, environmental protection, greenness, cleanness and the like. The power battery is a common power source in the new energy automobile and one of the most important parts in the new energy automobile, and the performance of the power battery directly influences the cruising ability and safety of the new energy automobile.
Nowadays, each major manufacturer can carry out the long circulation life test consuming time to only to the battery package, carries out analysis and judgement to hundreds of thousands of circulation test results to judge whether battery package circulation life test is up to standard, this has increased test cycle undoubtedly, has increaseed the research and development cost. In addition, the method only analyzes the test result of the battery pack without other references, so that the analysis result is inaccurate due to the fact that the analysis is only performed on the test result of the battery pack.
Disclosure of Invention
The invention provides a method for testing the cycle life of a battery pack, which is used for solving the problems of increasing the test period and increasing the research and development cost caused by only carrying out a long-time-consuming cycle life test on the battery pack.
In order to solve the technical problems, the technical scheme and the beneficial effects of the invention are as follows:
the invention discloses a method for testing the cycle life of a battery pack, which comprises the following steps:
carrying out cycle life test on the battery pack under a set working condition, and detecting the actual capacity of the battery pack after X times of cycle test; carrying out cycle life test on the single batteries in the same batch with the single batteries in the battery pack under a standard working condition, and detecting the actual capacity of the single batteries after carrying out cycle test for X times; judging whether the actual capacity of the battery pack after the X times of the cycle test is more than or equal to Y times of the actual capacity of the single battery after the X times of the cycle test: if the actual capacity of the battery pack after the X times of cyclic tests is more than or equal to Y times of the actual capacity of the single battery after the X times of cyclic tests, judging that the cyclic service life test of the battery pack reaches the standard; wherein Y is more than or equal to 0.9.
The beneficial effects are as follows: the invention takes the cycle life test result of the single battery in the battery pack as a reference standard, analyzes and compares the cycle life test result of the battery pack with the cycle life test result of the single battery in the battery pack, and can judge whether the cycle life test result of the battery pack reaches the standard or not by carrying out less cycle life tests on the battery pack, thereby more rapidly finding the problem of the battery pack, facilitating the faster solving of the problem of the battery pack, greatly shortening the test period and saving the research and development cost.
Further, when X is greater than the set times, if the actual capacity of the battery pack after X times of the cycle test is smaller than Y times of the actual capacity of the single battery after X times of the cycle test, the cycle life test of the battery pack is judged not to reach the standard. When the X is set to be larger, the cycle life test result of the single battery is only needed to be compared once, and whether the cycle life test of the battery pack reaches the standard can be judged directly through the cycle life test result of X times.
Further, when the X is less than or equal to the set times, if the actual capacity of the battery pack after the X times of the cycle test is less than the Y times of the actual capacity of the single battery after the X times of the cycle test, respectively and continuously performing corresponding cycle life tests on the battery pack and the single batteries in the battery pack until the set times are reached, and if the actual capacity of the battery pack after the set times is still less than the Y times of the actual capacity of the single battery after the set times, judging that the cycle life test of the battery pack does not reach the standard. When the X is set to be smaller, if the actual capacity of the battery pack after the X times of the cycle test is more than or equal to Y times of the actual capacity of the single battery after the X times of the cycle test, the cycle life test of the battery pack can be judged to reach the standard through a small number of cycle life tests.
Further, the cycle life test process under the set working condition is as follows: 1) carrying out standard charging on the battery pack until full charging is achieved; 2) circularly and sequentially fully discharging the battery pack according to the following charging current or discharging current: +2C, -1C, -1/3C, +1/3C, +1/2C, +1C, wherein, -represents charging and + represents discharging until full discharge is reached.
Further, the cycle test process of the service life under the standard working condition is as follows: 1) with I1(A) Discharging to a predetermined discharge termination condition; 2) standing for no less than 30min or specified standing condition; 3) with I1(A) When the current is charged to the specified charging termination voltage by constant current, the constant voltage charging is carried out until the charging termination current is reduced to 0.05I1(A) Stopping charging, and standing for 1 h; 4) standing for no less than 30min or specified standing condition; 5) with I1(A) Discharging to a predetermined discharge termination condition; wherein, I1(A) To set the current.
Further, the set number of times is 100.
Further, Y is 0.9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.
The method comprises the following steps:
the embodiment provides a method for testing the cycle life of a battery pack, and the battery to which the method is directed is a battery pack comprising a plurality of single batteries connected in series. The method respectively carries out cycle life tests on the battery pack and the single battery, and compares the test results of the battery pack and the single battery to judge whether the cycle life test of the battery pack reaches the standard.
The method comprises the following steps of:
1) carrying out standard charging on the battery pack until full charging is achieved;
2) and (3) carrying out cycle life test N times under the condition of 20-40 ℃ according to the working condition shown in the table 1 until the total voltage of the battery pack is reduced to the end voltage or any single voltage is reduced to the lower limit of the single voltage, wherein N is the minimum value of the total voltage of the battery pack to the end voltage or any single voltage to the lower limit of the single voltage, and the battery pack is fully discharged under the condition.
Step 1 is a full charge process, step 2 is a full discharge process, and the full charge process and the full discharge process are defined as a cycle life test process for performing a cycle life test on the battery pack under a set working condition.
TABLE 1
| Time increment/s | Cumulative time/s | current/A |
| 5 | 5 | +2C |
| 3 | 8 | -1C |
| 7 | 15 | -1/3C |
| 40 | 55 | +1/3C |
| 30 | 85 | +1/2C |
| 15 | 100 | +1C |
In the table, + represents discharge and-represents charge. The working condition cycle of the battery pack is 100% DOD, namely the battery pack is fully charged according to the step 1), and the full charging process is adopted; and then, circulating the working conditions for N times according to the step 2), so that the battery pack reaches the discharge termination condition and is in a full discharge process.
For the single battery, according to the requirement of the national standard GB/T31484-2015 power storage battery cycle life for electric vehicles and the requirement of the test method 6.4 standard cycle life, the standard cycle life test is carried out according to the following steps, and the steps 1) -5) are completely executed, which is defined as a life cycle test process for the single battery cycle life test under the standard working condition:
1) with 1I1(A) Discharging to the discharge termination condition specified by the enterprise;
2) laying aside for not less than 30min or enterprise-specified laying aside conditions;
3) with 1I1(A) When the current is charged to the charging termination voltage specified by enterprises in a constant current mode, the constant voltage charging mode is switched to the charging termination current mode to be reduced to 0.05I1(A) Stopping charging, and standing for 1h (or standing time not higher than 1h specified by enterprises) after charging;
4) laying aside for not less than 30min or enterprise-specified laying aside conditions;
5) with 1I1(A) Discharging to the discharge termination condition specified by the enterprise.
It should be noted that the standard operating condition defined in this embodiment is a standard cycle life test.
Based on the working conditions, the battery pack and the single battery are respectively subjected to cycle life tests by the following method so as to judge whether the cycle life test of the battery pack reaches the standard.
Step 1, carrying out cycle life test on a battery pack under a set working condition, and detecting the actual capacity C1 of the battery pack after 100 times of cycle test; and (3) carrying out standard cycle life test on a certain single battery in the same batch as the battery pack in the battery pack under a standard working condition, and detecting the actual capacity C2 of the single battery after carrying out the cycle test for 100 times. Comparing the actual capacity C1 of the battery pack after 100 times of the cycle test with the actual capacity C2 of the single battery after 100 times of the cycle test, and judging whether the actual capacity C2 of the single battery meets the condition that C1 is more than or equal to 90% C2: if the condition is met, the test can be ended in advance, and the cycle life test of the battery pack is judged to reach the standard; if the condition is not satisfied, step 2 is executed.
And 2, continuously performing cycle life test on the battery pack and the single battery respectively. Similarly, carrying out a cycle life test on the battery pack under a set working condition, and detecting the actual capacity C3 of the battery pack after carrying out the cycle test for 100 times again; and (5) carrying out cycle life test on the single battery under the standard working condition, and detecting the actual capacity C4 of the single battery after carrying out cycle test for 100 times again. Comparing the actual capacity C3 of the battery pack after the cycle test for 200 times with the actual capacity C4 of the single battery after the cycle test for 200 times, and judging whether the actual capacity C4 of the single battery meets the condition that C3 is more than or equal to 90% C4: if the condition is met, the test can be ended in advance, and the cycle life test of the battery pack is judged to reach the standard; if the condition is not satisfied, step 3 is executed.
And step 3, continuously performing cycle life test on the battery pack and the single battery respectively. Similarly, carrying out a cycle life test on the battery pack under a set working condition, and detecting the actual capacity C5 of the battery pack after carrying out the cycle test for 100 times again; and (5) carrying out cycle life test on the single battery under the standard working condition, and detecting the actual capacity C6 of the single battery after carrying out cycle test for 100 times again. Comparing the actual capacity C5 of the battery pack after the cycle test for 300 times with the actual capacity C6 of the single battery after the cycle test for 300 times, and judging whether the actual capacity C6 of the single battery meets the condition that C5 is more than or equal to 90% C6: if the condition is met, the test can be ended in advance, and the cycle life test of the battery pack is judged to reach the standard; if the condition is not met, the cycle life test of the battery pack is judged not to reach the standard.
It should be noted that, in order to save time, the cycle life test of the battery pack and the cycle life test of the single battery in the method can be performed simultaneously. Of course, the cycle life test may be performed on the battery pack first, or the cycle life test may be performed on the single battery first, which only takes much time.
In the above embodiment, the number of times of performing the cycle life test in each of steps 1, 2 and 3 is 100, which is set to be small, if the number of times of performing the cycle life test in each of steps 1, 2 and 3 is 100, the test can be ended in advance if the number of times of performing the cycle life test in each of steps C1 is greater than or equal to 90% C2, and it can be determined that the cycle life test of the battery pack reaches the standard through the small number of times of performing. Of course, as another embodiment, in step 1, the number of times of setting the cycle test of both the battery pack and the single battery is larger, for example, set to 300, it can be directly determined whether the cycle life test of the battery pack reaches the standard, if C1 is greater than or equal to 90% C2, it is determined that the cycle life test of the battery pack reaches the standard, otherwise, it does not reach the standard, and step 2 and step 3 do not need to be executed again. In addition, when the comparison determination is performed, Y in the determination condition is selected to be 90%, and if the requirement for the battery pack is strict, Y greater than 90% may be selected as the determination condition.
In the above embodiment, when the cycle life test is performed on the single battery, only one single battery in the same batch as the battery pack is selected for the cycle life test. Certainly, in order to ensure that the cycle life test of the single battery is standard and accurate, 2, 3 or even a plurality of single batteries can be selected to simultaneously perform the cycle life test, and under the condition that the cycle life test data of the plurality of single batteries has a similar change rule (for example, the voltage of each single battery can be detected in real time), the cycle life test result of one single battery is selected as the final cycle life test result of the single battery, so as to eliminate the data which do not conform to the change rule. On the whole, the method compares and analyzes the cycle life test result of the battery pack and the standard cycle life test result of the single battery, and can judge whether the cycle life test result of the whole battery pack is qualified or not only by relatively few cycle times, thereby greatly shortening the test period and saving the research and development cost. In addition, the test method organically combines the battery pack and the single battery, analyzes the result of the cycle life test of the battery pack from the single battery serving as a reference system, can find the problem more quickly and explain the phenomenon more scientifically and reasonably, and thus solves the problem more quickly. Meanwhile, the test method for the cycle life test of the battery pack is different from that for the cycle life test of the single battery, and the sampling method are comparable after the cycle is cycled for 100 times. Because the battery pack is subjected to the cycle life test under the set working condition, the difficulty of the cycle of the battery pack is increased, higher requirements are provided for the battery pack test, through less cycles, not less challenges are brought to the battery cell, the capacity retention rate of the battery cell can be obviously reduced, and higher requirements are provided for the safety and the capacity of the battery cell. Therefore, the two can be compared to shorten the research and development period.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (7)
1. A method for testing the cycle life of a battery pack is characterized by comprising the following steps:
carrying out cycle life test on the battery pack under a set working condition, and detecting the actual capacity of the battery pack after X times of cycle test;
carrying out cycle life test on the single batteries in the same batch with the single batteries in the battery pack under a standard working condition, and detecting the actual capacity of the single batteries after carrying out cycle test for X times;
judging whether the actual capacity of the battery pack after the X times of the cycle test is more than or equal to Y times of the actual capacity of the single battery after the X times of the cycle test: if the actual capacity of the battery pack after the X times of cyclic tests is more than or equal to Y times of the actual capacity of the single battery after the X times of cyclic tests, judging that the cyclic service life test of the battery pack reaches the standard; wherein Y is more than or equal to 0.9.
2. The method for testing the cycle life of a battery pack according to claim 1, wherein when X is greater than the set number of times, if the actual capacity of the battery pack after X times of the cycle test is less than Y times of the actual capacity of the single battery after X times of the cycle test, the cycle life test of the battery pack is determined to be not up to standard.
3. The method for testing the cycle life of the battery pack according to claim 1 or 2, wherein when X is less than or equal to the set number of times, if the actual capacity of the battery pack after X times of the cycle test is less than Y times of the actual capacity of the single battery after X times of the cycle test, the corresponding cycle life tests are continuously performed on the battery pack and the single batteries in the battery pack respectively until the set number of times is reached, and if the actual capacity of the battery pack after the set number of times is still less than Y times of the actual capacity of the single battery after the set number of times, the cycle life test of the battery pack is determined to be not up to the standard.
4. The method for testing the cycle life of the battery pack according to claim 1, wherein the cycle life test process under the set working condition is as follows: 1) carrying out standard charging on the battery pack until full charging is achieved; 2) and circularly and sequentially charging and discharging the battery pack according to the following charging current or discharging current: +2C, -1C, -1/3C, +1/3C, +1/2C, +1C, wherein, -represents charging, + represents discharging until the total voltage of the battery pack drops to a set end voltage or the voltage of any single battery drops to a set lower limit of the single voltage and the battery pack reaches full discharge.
5. The method for testing the cycle life of the battery pack according to claim 1, wherein the cycle life test process under the standard working condition is as follows:
1) with I1(A) Discharging to a predetermined discharge termination condition;
2) standing for no less than 30min or specified standing condition;
3) with I1(A) When the current is charged to the specified charging termination voltage by constant current, the constant voltage charging is carried out until the charging termination current is reduced to 0.05I1(A) Stopping charging, and standing for 1 h;
4) standing for no less than 30min or specified standing condition;
5) with I1(A) Discharging to a predetermined discharge termination condition;
wherein, I1(A) To set the current.
6. The method as claimed in claim 3, wherein the set number is 100.
7. The method of claim 1, wherein Y is 0.9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113740748A (en) * | 2021-09-03 | 2021-12-03 | 深圳市新威尔电子有限公司 | Battery detection method for sending message based on CAN bus |
| CN113740748B (en) * | 2021-09-03 | 2024-04-26 | 深圳市新威尔电子有限公司 | Battery detection method based on CAN bus sending message |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113740748A (en) * | 2021-09-03 | 2021-12-03 | 深圳市新威尔电子有限公司 | Battery detection method for sending message based on CAN bus |
| CN113740748B (en) * | 2021-09-03 | 2024-04-26 | 深圳市新威尔电子有限公司 | Battery detection method based on CAN bus sending message |
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